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Posts: 63 Member Since: July 28, 2011

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October 28, 2013 21:53:27

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hi, a couple of questions about GetMarketTradedVolume
( http://bdp.betfair.com/docs/GetMarketTradedVolume.html )


First: why in the response data there are matched volume associated to prices "out of range"?
For example, in:
6977581~0~0.0~0.0~0.0|9.87~73.43|10.32~184.41|10.5~11.84|10.73~0.02|10.77~666.05|11.0~9.47|11.2~87.64|11.22~243.34
there are many invalid prices like 10.32, 10.77, ecc.
BSP is not an explanation: those volume are before the off.

Second, and more important:
let R be a runner, p a price and t1, t2 two distinct times when we get the volume data, t1 precedes t2.
So we have v1 as the volume for runner R on price p at time t1,
and v2 as the volume for the same runner on the same price at time t2.
How could it ever be that there are situation where v2 is less than v1?
Shouldn't the matched volume data on a runner and price always increase over time? 
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JayBee

rookie botter

Posts: 31 Member Since:October 21, 2013

#1 [url]

October 28, 2013 22:43:16

pichi, a couple of questions about GetMarketTradedVolume
( http://bdp.betfair.com/docs/GetMarketTradedVolume.html )


First: why in the response data there are matched volume associated to prices "out of range"?
For example, in:
6977581~0~0.0~0.0~0.0|9.87~73.43|10.32~184.41|10.5~11.84|10.73~0.02|10.77~666.05|11.0~9.47|11.2~87.64|11.22~243.34
there are many invalid prices like 10.32, 10.77, ecc.
BSP is not an explanation: those volume are before the off.

Second, and more important:
let R be a runner, p a price and t1, t2 two distinct times when we get the volume data, t1 precedes t2.
So we have v1 as the volume for runner R on price p at time t1,
and v2 as the volume for the same runner on the same price at time t2.
How could it ever be that there are situation where v2 is less than v1?
Shouldn't the matched volume data on a runner and price always increase over time? 

Hello pic,

Simply, one or more horses have been removed from the race.

When this happens the odds on the remaining horses are altered to keep the book at par with probabilities afore the non-runners were removed so the odds will be altered slightly.

There are rules for "non-runner reductions" somewhere on this page http://www.betfair.com/aboutUs/Rules.and.Regulations/

I don't understand the description of the second part of your question so maybe you could illucidate more. But I am guessing that you observe a decrease in volume for a runner? In which makret is this? Win, place or reverse(forecast)?

JayBee.

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bot addict

Posts: 63 Member Since:July 28, 2011

#2 [url]

October 29, 2013 22:58:20

hi,

sure, removed runners, I should have thought at them by myself!
They also explain the second part: "apparent" decrease in volume for a runner.

Thanks JayBee

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